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Jeong, Won Young; An, Seung Kook

doi:10.1023/a:1017995509102

Cited by 24 publications

(8 citation statements)

References 6 publications

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“…from 0.23 to 0.467 nm and become larger than that of the water vapor (R w =0.4 nm). 16 Lower τ 3 , R, I 3 or f v at lower temperature and higher τ 3 , R, I 3 or f v at higher temperature imply that TSPU membranes have good moisture barrier effect at lower temperature but a higher WVP at higher temperature.…”

Section: (2)mentioning

confidence: 94%

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Thermo-sensitive polyurethane membrane with controllable water vapor permeation for food packaging

et al. 2009

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The size and shape of free volume (FV) holes available in membrane materials control the rate of gas diffusion and its permeability. Based on this principle, a segmented, thermo-sensitive polyurethane (TSPU) membrane with functional gate, i.e., the ability to sense and respond to external thermo-stimuli, was synthesized. This smart membrane exhibited close-open characteristics to the size of the FV hole and water vapor permeation and thus can be used as smart food packaging materials. Differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), positron annihilation lifetimes (PAL) and water vapor permeability (WVP) were used to evaluate how the morphological structure of TSPU and the temperature influence the FV holes size. In DSC and DMA studies, TSPU with a crystalline transition reversible phase showed an obvious phase-separated structure and a phase transition temperature at 53 o C (defined as the switch temperature and used as a functional gate). Moreover, the switch temperature (T s ) and the thermal-sensitivity of TSPU remained available after two or three thermal cyclic processes. The PAL study indicated that the FV hole size of TSPU is closely related to the T ·d, which produced an "increase-decrease" response to the thermo-stimuli. This phase transition accompanying significant changes in the FV hole size and WVP can be used to develop "smart materials" with functional gates and controllable water vapor permeation, which support the possible applications of TSPU for food packaging.

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Section: (2)mentioning

confidence: 94%

“…16 Furthermore, the average size of free volume holes (V h ) and the fractional free volume f v (%) can be calculated by eqs. (3) and (4) Where, C is empirically determined to be 0.0018 from the specific volume data.…”

Section: (2)mentioning

confidence: 99%

Thermo-sensitive polyurethane membrane with controllable water vapor permeation for food packaging

et al. 2009

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“…However, the surface of polyurethane would need further functionalization to introduce value-added protection mechanisms. A laminated coating of microporous PU membrane with polytetrafluoroethylene (PTFE) was used to form water and vapor resistant fabrics for sportswear [14]. Waterproof-breathable PU nanofibers coating has been used as high performance protective clothing for sportswear industry [15,16].…”

Section: Introductionmentioning

confidence: 99%

Coating of TPU-PDMS-TMS on Polycotton Fabrics for Versatile Protection

2017

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This research aims to develop a non-fluorine based and durable coating technology that brings excellent hydrophobic, oleophobic and aqueous liquid repellent properties to polycotton fabrics (blend ratio 80/20 for cotton/polyester) while maintaining comfort to an acceptable level. A crosslinked network from thermoplastic polyurethane (TPU), polydimethylsiloxane (PDMS) and trimethylated silica (TMS) has been formed on the surface of polycotton fabrics by the conventional padding-knife coating-padding-curing technique. A series of characterizations have been conducted to understand the chemical components, morphology, versatile protection and comfort of the coated fabrics. The TPU-PDMS-TMS (TPT) coated fabrics showed a high hydrophobic surface with a high water contact angle of 142 • , and the coating was durable against different cycles of laundering and crocking. The coated fabrics also showed excellent repellency against oils, liquids and chemicals for a long period of time. The coating has affected the air permeability and water vapor permeability together with the moisture management property of the polycotton fabrics, and the thermal resistance of the polycotton fabric has been enhanced at the same time. The coating technology developed can be further applied in protective clothing and functional textiles in different areas including military, mining and outdoor protection gear.

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“…At present, the application of WPU in synthetic leather is mainly concentrated on surface finishing . Porous coatings are still manufactured through wet and thermal coagulations processes by solvent extraction and solvent evaporation using solvent‐borne PU . Thus, the pollution problem in the production process of synthetic leather has not yet been completely solved.…”

Section: Introductionmentioning

confidence: 99%

The effect of acrylate on structure and properties of waterborne polyurethane porous coated fabrics

Zheng

Ming

Rui³

et al. 2017

J of Applied Polymer Sci

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Porous-coated fabrics used for synthetic leather were prepared by mechanical foaming method using blends of waterborne polyurethanes (WPUs) and polyacrylate (AC). The effect of AC on structure and properties of WPU/AC coated fabrics was investigated. Fourier transform infrared spectroscopy and differential scanning calorimetry results indicated that there is hydrogen bonding between WPU and AC and the compatibility of the blend system gets worse after AC/WPU ratio is higher than 30/70. Thermogravimetric analysis demonstrated that the thermal stability of porous coatings is improved with increasing AC. Scanning electron microscopy images showed that porous coatings have semi-open cellular structure with a great number of surface pores and window pores, imparting excellent air permeability and water vapor permeability to coated fabrics. On the basis of morphology analysis, the forming process of cell structure of WPU/AC coated fabrics was proposed. Performance tests showed that the overall performance of coated fabrics is best with AC/WPU ratio ranging from 15/85 to 30/70.

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Untitled

Cited by 24 publications

References 6 publications

Thermo-sensitive polyurethane membrane with controllable water vapor permeation for food packaging

Thermo-sensitive polyurethane membrane with controllable water vapor permeation for food packaging

Coating of TPU-PDMS-TMS on Polycotton Fabrics for Versatile Protection

The effect of acrylate on structure and properties of waterborne polyurethane porous coated fabrics

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